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Diffstat (limited to 'boards/at91sam7xc-ek/board_cstartup_iar.s')
| -rw-r--r-- | boards/at91sam7xc-ek/board_cstartup_iar.s | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/boards/at91sam7xc-ek/board_cstartup_iar.s b/boards/at91sam7xc-ek/board_cstartup_iar.s new file mode 100644 index 0000000..848e5ba --- /dev/null +++ b/boards/at91sam7xc-ek/board_cstartup_iar.s @@ -0,0 +1,190 @@ +/* ----------------------------------------------------------------------------
+ * ATMEL Microcontroller Software Support
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ----------------------------------------------------------------------------
+ */
+
+/*
+ IAR startup file for AT91SAM7XC microcontrollers.
+ */
+
+ MODULE ?cstartup
+
+ ;; Forward declaration of sections.
+ SECTION IRQ_STACK:DATA:NOROOT(2)
+ SECTION CSTACK:DATA:NOROOT(3)
+
+//------------------------------------------------------------------------------
+// Headers
+//------------------------------------------------------------------------------
+
+#define __ASSEMBLY__
+#include "board.h"
+
+//------------------------------------------------------------------------------
+// Definitions
+//------------------------------------------------------------------------------
+
+#define ARM_MODE_ABT 0x17
+#define ARM_MODE_FIQ 0x11
+#define ARM_MODE_IRQ 0x12
+#define ARM_MODE_SVC 0x13
+#define ARM_MODE_SYS 0x1F
+
+#define I_BIT 0x80
+#define F_BIT 0x40
+
+//------------------------------------------------------------------------------
+// Startup routine
+//------------------------------------------------------------------------------
+
+/*
+ Exception vectors
+ */
+ SECTION .vectors:CODE:NOROOT(2)
+
+ PUBLIC resetVector
+ PUBLIC irqHandler
+
+ EXTERN Undefined_Handler
+ EXTERN SWI_Handler
+ EXTERN Prefetch_Handler
+ EXTERN Abort_Handler
+ EXTERN FIQ_Handler
+
+ ARM
+
+__iar_init$$done: ; The interrupt vector is not needed
+ ; until after copy initialization is done
+
+resetVector:
+ ; All default exception handlers (except reset) are
+ ; defined as weak symbol definitions.
+ ; If a handler is defined by the application it will take precedence.
+ LDR pc, =resetHandler ; Reset
+ LDR pc, Undefined_Addr ; Undefined instructions
+ LDR pc, SWI_Addr ; Software interrupt (SWI/SYS)
+ LDR pc, Prefetch_Addr ; Prefetch abort
+ LDR pc, Abort_Addr ; Data abort
+ B . ; RESERVED
+ LDR pc, =irqHandler ; IRQ
+ LDR pc, FIQ_Addr ; FIQ
+
+Undefined_Addr: DCD Undefined_Handler
+SWI_Addr: DCD SWI_Handler
+Prefetch_Addr: DCD Prefetch_Handler
+Abort_Addr: DCD Abort_Handler
+FIQ_Addr: DCD FIQ_Handler
+
+/*
+ Handles incoming interrupt requests by branching to the corresponding
+ handler, as defined in the AIC. Supports interrupt nesting.
+ */
+irqHandler:
+ /* Save interrupt context on the stack to allow nesting */
+ SUB lr, lr, #4
+ STMFD sp!, {lr}
+ MRS lr, SPSR
+ STMFD sp!, {r0, lr}
+
+ /* Write in the IVR to support Protect Mode */
+ LDR lr, =AT91C_BASE_AIC
+ LDR r0, [r14, #AIC_IVR]
+ STR lr, [r14, #AIC_IVR]
+
+ /* Branch to interrupt handler in Supervisor mode */
+ MSR CPSR_c, #ARM_MODE_SYS
+ STMFD sp!, {r1-r3, r4, r12, lr}
+
+ /* Check for 8-byte alignment and save lr plus a */
+ /* word to indicate the stack adjustment used (0 or 4) */
+ AND r1, sp, #4
+ SUB sp, sp, r1
+ STMFD sp!, {r1, lr}
+
+ MOV lr, pc
+ BX r0
+
+ LDMIA sp!, {r1, lr}
+ ADD sp, sp, r1
+
+ LDMIA sp!, {r1-r3, r4, r12, lr}
+ MSR CPSR_c, #ARM_MODE_IRQ | I_BIT
+
+ /* Acknowledge interrupt */
+ LDR lr, =AT91C_BASE_AIC
+ STR lr, [r14, #AIC_EOICR]
+
+ /* Restore interrupt context and branch back to calling code */
+ LDMIA sp!, {r0, lr}
+ MSR SPSR_cxsf, lr
+ LDMIA sp!, {pc}^
+
+
+/*
+ After a reset, execution starts here, the mode is ARM, supervisor
+ with interrupts disabled.
+ Initializes the chip and branches to the main() function.
+ */
+ SECTION .cstartup:CODE:NOROOT(2)
+
+ PUBLIC resetHandler
+ EXTERN LowLevelInit
+ EXTERN ?main
+ REQUIRE resetVector
+ ARM
+
+resetHandler:
+
+ /* Set pc to actual code location (i.e. not in remap zone) */
+ LDR pc, =label
+
+ /* Perform low-level initialization of the chip using LowLevelInit() */
+label:
+ LDR r0, =LowLevelInit
+ LDR r4, =SFE(CSTACK)
+ MOV sp, r4
+ MOV lr, pc
+ BX r0
+
+ /* Set up the interrupt stack pointer. */
+ MSR cpsr_c, #ARM_MODE_IRQ | I_BIT | F_BIT ; Change the mode
+ LDR sp, =SFE(IRQ_STACK)
+
+ /* Set up the SYS stack pointer. */
+ MSR cpsr_c, #ARM_MODE_SYS | F_BIT ; Change the mode
+ LDR sp, =SFE(CSTACK)
+
+ /* Branch to main() */
+ LDR r0, =?main
+ MOV lr, pc
+ BX r0
+
+ /* Loop indefinitely when program is finished */
+loop4:
+ B loop4
+
+ END
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